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OCPD as current limiter

lyledunn

Whilst it is implicit in 433.1.1 and others, I am sure that I saw a regulation that specifically stated that an overcurrent protective device should not be used to limit the normal current in a circuit. If I was to guess, it might have been in 15th or 16th editions, which I have trawled through without success. 

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    I can only think of 433.1 - "Every circuit should be designed so that small overload of long duration is unlikely to occur" - which given the characteristics of a fuse or MCB sort of rules it out to me, as it would only limit (well, monitor and disconnect, rather than limit in the conventional sense) if there was an overload that persisted for a significant time.

      - Andy.

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    I can only think of 433.1 - "Every circuit should be designed so that small overload of long duration is unlikely to occur" - which given the characteristics of a fuse or MCB sort of rules it out to me, as it would only limit (well, monitor and disconnect, rather than limit in the conventional sense) if there was an overload that persisted for a significant time.

      - Andy.

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